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Atmospheric pressure is the force exerted by the weight of the atmosphere per unit area on the Earth's surface or any object within it. It is caused by the gravitational attraction of the Earth, which pulls air molecules towards the surface, creating pressure. Atmospheric pressure is an essential concept in fluid mechanics as it influences various fluid properties, such as buoyancy, flow behavior, and pressure distribution.

At sea level, atmospheric pressure has a standard value, known as standard atmospheric pressure, which is approximately 101.325 kPa (kilopascals) or 1.01325 bar. This pressure decreases with altitude because the density of air decreases as the height above sea level increases.

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